Further to what Ted said earlier, we've been hosting an IWP solution using FMS 7 Advanced for nearly two months now with no problems. The solution is used by 500+ clients, most of whom are regional/remote.

I have FM Server 5 on Windows 2000. I just added a second FM Server 5 on Windows XP. Now, one or the other server drops off the "hosts" list (but not both)

I believe it is related to the UDP problem described in this thread

Is anyone successfully running 2 or more FileMaker Servers 5 or 5.5, on the same network, on Windows 2000 or higher, where users can "see" both servers?

If so, please post your configuration. Thanks!

Zardoz, you are the man!

As per my post on this topic two years ago, we would still intermittently experience this problem. As of early this summer, we had four FMP 5.5 Servers on a mix of W2K and W2k3 OS's hosting around 300 files. We finally gave up trying to get any info about this problem from paid Filemaker support. They would just continue with their "no known issues" mantra.

But Zardoz, you have nailed the problem completely. Thanks for you dilegence and willingness to share your knowledge. Your detective work and explanations have finally let me understand what was going on.

Since early this summer we have migrated to Filemaker 7 and have not had a single instance of hosts disappearing. Now we have a boatload of FMP7 problems, but that's another topic entirely...